Impeller stabilizing device

Abstract

The utility model discloses a kind of impeller stabilizing device, by first auxiliary bearing assembly provides main damping in pump shaft root, second auxiliary bearing assembly is righted in impeller distal end, radial, axial vibration and impeller yaw are cooperated and inhibited, operation stability is greatly improved while auxiliary bearing assembly core function is not main support but vibration damping, its elastic damping piece effectively isolates vibration, creates the stable working environment for rear main bearing and mechanical seal, significantly prolongs the service life of core component, solves the prior art only by moving support point forward to shorten cantilever, this can only reduce the shaking of root to a certain extent, but for the vibration suppression effect of impeller distal end, i.

Description

Technical Field

[0001] This utility model relates to the field of impeller technology, specifically to an impeller stabilizing device. Background Technology

[0002] As a general fluid transport device, the operational stability of the impeller, the core component of a centrifugal pump, directly affects the efficiency, reliability, and lifespan of the entire pump.

[0003] Furthermore, the application document with publication number CN221195504U mentions a structure for the stability of the centrifugal pump impeller. This structure has the bearing set on the pump cover, so that the support point of the pump shaft is close to the impeller. When the impeller rotates, it will not wobble, reducing the power loss of the centrifugal pump. At the same time, it avoids one-sided friction between the impeller and the first and second sealing rings, extending the service life of the sealing rings. However, there are still some defects that need to be optimized. The specific defects are as follows: the existing technology only shortens the cantilever by moving the support point forward. This can only reduce the wobble at the root to a certain extent, but the vibration suppression effect at the far end of the impeller, i.e. the suction pipe end, is limited. The change of a single rigid support point cannot effectively cope with the multi-directional and multi-order vibrations generated under complex working conditions.

[0004] Therefore, there is an urgent need to design an impeller stabilizing device that can solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an impeller stabilizing device to solve the problem.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An impeller stabilizing device includes a pump body and a pump cover, the pump body and the pump cover being connected by a flange, and the pump cover extending into the pump cavity to form a boss; The pump shaft and impeller are connected by a key and drive the impeller, with the pump shaft passing through the pump cover and extending into the pump chamber inside the pump body. The pump shaft is axially positioned by a shaft shoulder and a lock nut. The first auxiliary bearing assembly is disposed between the boss and the pump shaft, and located on the back of the impeller hub; the first auxiliary bearing assembly also includes a first inner sleeve fixedly connected to the pump shaft, a first outer sleeve fixedly connected to the boss, and a first elastic damping element disposed in the annular gap between the two. The second auxiliary bearing assembly is disposed between the inner side of the inlet of the pump body and the outer side of the suction pipe of the impeller; the second auxiliary bearing assembly also includes a second inner sleeve fixedly connected to the outer side of the suction pipe, a second outer sleeve fixedly connected to the pump body, and a second elastic damping element disposed in the annular gap between the two. The main seal is provided between the back plate of the impeller and the end face of the boss.

[0007] Furthermore, the first elastic damping element and the second elastic damping element are at least one rubber ring, which is embedded in an annular groove opened in the outer side wall of the first inner sleeve and the second inner sleeve and the inner side wall of the first outer sleeve and the second outer sleeve. Through the above technical solution, the rubber material can provide excellent elastic deformation capacity and damping characteristics. When the inner sleeve shifts slightly with the impeller, the rubber ring absorbs vibration energy through its own compression and shear deformation, thereby playing a role in vibration reduction and buffering.

[0008] Furthermore, the number of the annular grooves is up to 1, and they are arranged at equal intervals along the axial direction. The Shore hardness of the rubber ring is 60HA to 70HA. By using the above technical solution and setting multiple damping points in the axial direction, a longer damping path and more uniform support force can be provided, thereby more effectively suppressing vibrations of different orders and possible sway, and improving stability.

[0009] Furthermore, the first inner sleeve is interference-fitted with the pump shaft, with an interference amount of 0.02mm to 0.05mm; the second inner sleeve is interference-fitted with the outside of the impeller's suction pipe. Through the above technical solutions, the core function of interference fit is to ensure the transmission of torque and motion without relative motion, avoiding fretting wear and additional vibration that may be caused by clearance fits such as key connections. At the same time, interference fit also provides reliable axial positioning and prevents inner sleeve slippage.

[0010] Furthermore, the main seal is a mechanical seal, with its stationary ring installed in the sealing seat on the end face of the boss, and the rotating ring rotating synchronously with the back plate of the impeller. The mechanical seal is a single-end-face balanced structure. Through the above technical solutions, mechanical seals have the advantages of reliable sealing performance, minimal leakage, and long service life.

[0011] Furthermore, the contact surfaces of the first elastic damping element and the second elastic damping element with the first inner sleeve and the second inner sleeve are respectively coated with grease; Through the above technical solution, the grease can form an oil film between the contact surface of the rubber ring and the metal sleeve, reducing the surface wear of the rubber during repeated deformation and extending its service life.

[0012] Compared with the prior art, the beneficial effects of this utility model are: In this utility model, the impeller stabilizing device achieves the following effects: 1. The first auxiliary bearing assembly provides main damping at the pump shaft root, and the second auxiliary bearing assembly straightens the impeller at the far end, thus synergistically suppressing radial and axial vibrations and impeller sway, significantly improving operational stability; 2. The core function of the auxiliary bearing assembly is vibration reduction rather than main support. Its elastic damping component effectively isolates vibration, creating a stable working environment for the downstream main bearing and mechanical seal, and significantly extending the service life of the core components. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall planar structure of this utility model; Figure 2 This is a schematic diagram of the overall auxiliary bearing assembly of this utility model; Figure 3 This is a schematic diagram of the first auxiliary bearing assembly of this utility model; Figure 4 This is a schematic diagram of the second auxiliary bearing assembly of this utility model.

[0014] In the figure: 1. Pump body; 2. Pump cover; 3. Boss; 4. Pump shaft; 5. Impeller; 71. First auxiliary bearing assembly; 711. First inner sleeve; 712. First outer sleeve; 713. First elastic damping element; 72. Second auxiliary bearing assembly; 721. Second inner sleeve; 722. Second outer sleeve; 723. Second elastic damping element; 9. Main seal; 704. Annular groove. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are provided. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0017] Please see Figure 1-3 This embodiment provides an impeller stabilizing device, including a pump body 1 and a pump cover 2. The pump body 1 and the pump cover 2 are connected by a flange, and the pump cover 2 extends into the pump cavity to form a boss 3. Pump shaft 4 and impeller 5, pump shaft 4 passes through pump cover 2 and extends into pump cavity inside pump body 1, pump shaft 4 is connected to impeller 5 by key and is axially positioned by shaft shoulder and lock nut; The first auxiliary bearing assembly 71 is disposed between the boss 3 and the pump shaft 4, and is located on the back of the impeller 5 hub; the first auxiliary bearing assembly 71 also includes a first inner sleeve 711 fixedly connected to the pump shaft 4, a first outer sleeve 712 fixedly connected to the boss 3, and a first elastic damping member 713 disposed in the annular gap between the two. The second auxiliary bearing assembly 72 is disposed between the inner side of the inlet of the pump body 1 and the outer side of the suction pipe of the impeller 5; the second auxiliary bearing assembly 72 also includes a second inner sleeve 721 fixedly connected to the outer side of the suction pipe, a second outer sleeve 722 fixedly connected to the pump body 1, and a second elastic damping element 723 disposed in the annular gap between the two. The main seal 9 is provided between the back plate of the impeller 5 and the end face of the boss 3. When the pump shaft 4 drives the impeller 5 to rotate at high speed, radial and axial unbalanced forces are generated due to factors such as hydraulic pulsation, manufacturing errors, and material unevenness. This is the root cause of vibration, and the generated vibration energy attempts to be transmitted outward through the pump shaft 4 and impeller 5. At this time, the first auxiliary bearing assembly 71 and the second auxiliary bearing assembly 72, which are located at two key positions, begin to function. The first elastic damping element 713 and the second elastic damping element 723 inside them deform, absorbing the vibration kinetic energy and converting it into heat energy for dissipation. Through the continuous occurrence of the above process, the swaying of the pump shaft 4 and the impeller 5 is effectively limited to a very small range, so that the dynamic and static rings of the main seal 9 maintain a good dynamic fit, wear is reduced, and the vibration transmitted to the main bearing and pump body 1 is also greatly reduced.

[0018] The first elastic damping element 713 and the second elastic damping element 723 are at least one rubber ring. The rubber ring is embedded in annular grooves 704 formed on the outer walls of the first inner sleeve 711 and the second inner sleeve 721, and on the inner walls of the first outer sleeve 712 and the second outer sleeve 722. There are 2 to 4 annular grooves 704, which are arranged at equal intervals along the axial direction. The Shore hardness of the rubber ring is 60HA to 70HA. The first inner sleeve 711 is interference-fitted with the pump shaft 4, with an interference amount of 0.02mm to 0.05mm. The second inner sleeve 721 is interference-fitted with the outside of the suction pipe of the impeller 5. The main seal 9 is a mechanical seal, with its stationary ring installed in the sealing seat on the end face of the boss 3. The rotating ring rotates synchronously with the back plate of the impeller 5. The mechanical seal is a single-end-face balanced structure. The contact surfaces of the first elastic damping element 713 and the second elastic damping element 723 with the first inner sleeve 711 and the second inner sleeve 721, respectively, are coated with grease. In the first auxiliary bearing assembly 71, the radial runout and bending vibration of the pump shaft 4 are directly transmitted to the interference-fitted first inner sleeve 711. The slight movement of the inner sleeve compresses the first elastic damping element 713, causing it to undergo continuous compression and shear deformation. The damping characteristics of the rubber ring convert the vibration mechanical energy into heat energy, thereby suppressing the vibration. The residual force that is not completely absorbed is transmitted to the pump cover 2 and pump body 1 through the first outer sleeve 712, rather than to the far-end drive bearing. Similarly, in the second auxiliary bearing assembly 72, the radial wobble of the cantilever end of the impeller 5 is directly transmitted to the interference-fitted second inner sleeve 721. The movement of the inner sleeve compresses the second elastic damping element 723, and the rebound force provided by the rubber ring immediately "pushes" the impeller 5 back to the center position. Together with the first assembly, they form a stable "double-point support" to prevent the impeller 5 from swinging like a pendulum. Under this premise, the main seal 9 Its stationary ring is fixed on the boss 3, and the moving ring rotates with the back plate of the impeller 5. Under normal conditions, it achieves zero leakage sealing. Since the first auxiliary bearing assembly 71 and the second auxiliary bearing assembly 72 greatly suppress vibration, they ensure that the moving and stationary rings always maintain excellent dynamic fit, avoiding uneven wear and jump leakage caused by vibration, thus greatly extending the service life.

[0019] The working process of this utility model is as follows: When using this impeller stabilizing device, firstly, when the pump shaft 4 is connected to the motor and drives the impeller 5 to rotate at high speed, due to factors such as hydraulic pulsation, manufacturing errors, and material unevenness, radial and axial unbalanced forces are generated. This is the root cause of vibration, and the generated vibration energy attempts to be transmitted outward through the pump shaft 4 and impeller 5. At this time, the first auxiliary bearing assembly 71 and the second auxiliary bearing assembly 72, which are located at two key positions, begin to function. The first elastic damping element 713 and the second elastic damping element 723 inside them deform, absorbing the vibration kinetic energy and converting it into heat energy for dissipation. Through the continuous execution of the above process, the shaking of the pump shaft 4 and impeller 5 is effectively limited to a very small range, so that the dynamic and static rings of the main seal 9 maintain a good dynamic fit, wear is reduced, and the vibration transmitted to the main bearing and pump body 1 is also greatly reduced. Specifically, in the first auxiliary bearing assembly 71, the radial runout and bending vibration of the pump shaft 4 are directly transmitted to the interference-fitted first inner sleeve 711. The minute movement of the inner sleeve compresses the first elastic damping element 713, causing it to undergo continuous compression and shear deformation. The damping characteristics of the rubber ring convert the vibration mechanical energy into heat energy, thereby suppressing the vibration. The residual force that is not completely absorbed is transmitted to the pump cover 2 and pump body 1 through the first outer sleeve 712, rather than to the remote drive end bearing. Similarly, in the second auxiliary bearing assembly 72, the radial wobble at the cantilever end of the impeller 5 is directly transmitted to the interference-fitted second inner sleeve 721. The movement of the inner sleeve compresses the second elastic damping element 723, and the rebound force provided by the rubber ring immediately "pushes" the impeller 5 back to the center position. Together with the first assembly, this forms a stable "double-point support," preventing the impeller 5 from swinging like a pendulum. Under this premise, the stationary ring of the main seal 9 is fixed on the boss 3, and the rotating ring rotates with the back plate of the impeller 5, achieving zero leakage sealing under normal conditions. Since the first auxiliary bearing assembly 71 and the second auxiliary bearing assembly 72 greatly suppress vibration, they ensure that the dynamic and stationary rings always maintain excellent dynamic fit, avoiding uneven wear and jump leakage caused by vibration, thus greatly extending the service life.

[0020] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An impeller stabilizing device, characterized in that: It includes a pump body (1) and a pump cover (2), which are connected by a flange. The pump cover (2) extends into the pump cavity to form a boss (3). Pump shaft (4) and impeller (5), the pump shaft (4) passes through the pump cover (2) and extends into the pump cavity inside the pump body (1), the pump shaft (4) is connected to the impeller (5) by a key and is axially positioned by a shoulder and a lock nut; The first auxiliary bearing assembly (71) is disposed between the boss (3) and the pump shaft (4) and located on the back of the impeller (5) hub; the first auxiliary bearing assembly (71) also includes a first inner sleeve (711) fixedly connected to the pump shaft (4), a first outer sleeve (712) fixedly connected to the boss (3), and a first elastic damping element (713) disposed in the annular gap between the two. The second auxiliary bearing assembly (72) is disposed between the inner side of the inlet of the pump body (1) and the outer side of the suction pipe of the impeller (5); the second auxiliary bearing assembly (72) also includes a second inner sleeve (721) fixedly connected to the outer side of the suction pipe, a second outer sleeve (722) fixedly connected to the pump body (1), and a second elastic damping element (723) disposed in the annular gap between the two. The main seal (9) is provided between the back plate of the impeller (5) and the end face of the boss (3).

2. The impeller stabilizing device according to claim 1, characterized in that: The first elastic damping member (713) and the second elastic damping member (723) are at least one rubber ring, which is embedded in the annular groove (704) opened on the outer side wall of the first inner sleeve (711) and the second inner sleeve (721) and the inner side wall of the first outer sleeve (712) and the second outer sleeve (722).

3. The impeller stabilizing device according to claim 2, characterized in that: The number of the annular grooves (704) is 2 to 4, and they are arranged at equal intervals along the axial direction. The Shore hardness of the rubber ring is 60HA to 70HA.

4. The impeller stabilizing device according to claim 1, characterized in that: The first inner sleeve (711) is interference-fitted with the pump shaft (4) with an interference amount of 0.02 mm to 0.05 mm; the second inner sleeve (721) is interference-fitted with the outside of the suction pipe of the impeller (5).

5. The impeller stabilizing device according to claim 1, characterized in that: The main seal (9) is a mechanical seal, with its stationary ring installed in the sealing seat on the end face of the boss (3), and the rotating ring rotating synchronously with the back plate of the impeller (5). The mechanical seal is a single-end-face balanced structure.

6. The impeller stabilizing device according to claim 1, characterized in that: The first elastic damping member (713) and the second elastic damping member (723) are respectively coated with grease on their contact surfaces with the first inner sleeve (711) and the second inner sleeve (721).

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